Answer:
<h2>4 bilion = 4 × 10⁹</h2>
Step-by-step explanation:
The scientific notation:

where

4 billion:
in USA: 4,000,000,000
in Europe: 4 000 000 000 000

Answer:
C. 17,820
Step-by-step explanation:
30,500-12,680= 17,820
Answer: 918km^2
Step-by-step explanation:

Let x be the new dimension of the area;

